removed the methods that return null for various getAs methods per discussions with Jesse and Joel.
removed the methods that return null for various getAs methods per discussions with Jesse and Joel.

git-svn-id: 7b8be7b2f8bf58e8147c910303b95fa2b8d9948f@844 2534bb62-2c4b-0410-85e8-b5006b95c4ae

mintern/gson